Hole gauge



M. BARTHOLDY.

HOLE GAUGE.

APPLICATION FILED NOV-6, 1920.

1,42,95L Patented June 27,1922.

STATES PA TE;NT OFFICE.

GESELLSCHAFT, OF- ESSEN-ON-THE-RUHR, GERMANY.

HOLE GAUGE.

Specification of Letters Patent. Patented June 27 1922 Application filed November 6, 1920. Serial No. 422,374.

I the German Republic, have invented a certain new .and useful Improvement in Hole Gauges, for which I have filed application in Germany Nov. 3, 1919, and of which the following is a specification.

This invention relates to hole gauges which are provided with an adjustable touch element and a member which is adapted to be displaced at an angle to the direction of movement of the movable touch element and acts upon an indicating device, and in which there is provided between the movable touch element and the displaceable member an inclined face which is inclined to the direction of displacement of the dis placeable member and is adapted to transmit movements. In the older gauges of this kind the parts are so arranged that pressure applied from outside to the adjustable touch element is unable to produce any movement of the displaceable member connected to the indicating device. Inthese gauges it is accordingly necessary to adjust the displaceable member by hand when measuring. The object of this invention is to provide a hole gauge of the kind described,-in which movement by hand of the displaceable member which acts on the indicating device is not necessary.

Two forms of execution of the subject matter of the invention, namely one suita-" ble for gauging large and the other for gauging small holes, are shown in the annexed drawing in which:

Fig. 1 is a part-sectional view of the improved hole gauge destined for gauging large holes,

Fig. 2is the front view to Fig. 1, look in from the left,

ig. 3 is a part-sectional view of the improved hole gauge suitable for gauging small holes, and I Fig. 4 a front view to Fig. 3. v

The embodiment shown in Figs. 1 and 2 will be described first.

The casing A of the .gauge consists of a substantially hollow cylindrical shank a", supporting at one end a head a embodying a graduated scale a and, at the other end. three arms a", a and a, respectively. The

longitudinal axes of these arms form angles of 120 relatively to each other and are dis posed at right angles to the longitudinal axis of the shank a The arms at anda are each provided, in the manner shown in the drawing, with a stationary touch bolt B terminating on the outside in a sphericallycurved surface 12 y The third arm a is equipped with a touch bolt C displaceable within and projecting beyond said arm a, and similarly rounded Off on the exterior. The extent to which the bolt C may be displaced is limited toward the exterior by a pair of check surfaces a 0 With its inner flat-end, said bolt C bears up against a ball" D adapted to turn on the level end face 0 of a bolt E screwed into the casing A. The end face 6 is disposed at an angle of 45 relatively to the longitudinal axis of the bolt C. Furthermore, a bolt G, adapted to be moved within the shank a under the 8.0-

tion of a spring F, bears up with its one end against the ball D. At the other end of the bolt Gr,- under the influence of a spring K lies another bolt H. Against this latter there engages under the influence of a spring M, one end i of an indicator J, pivotally mounted on a fixed pin N, the end of which swings over a scale (L The manner of operation of the improved instrument will be readily understood from. the foregoing description and does not there fore require any further explanation.

The. second form of execution as disclosed in Figs. 3 and 4, merely difi'ers from the first formby the fact that the ball D, serving to displace the bolt G, forms at the same time the displaceable touoh element proper, and further, that the gauge is provided in the place of the arms a and a supporting the stationary bolts B, with two centering-lugs a shown in Fig. 4.

The manner of operation of this second form of construction will likewise be plain without further explanation.

Claims:

1. A hole gauge having a displaceable 100 body, a member displaceable in a direction said indicating device, a member provided 105 with a face, inclined to the direction of movement of said displaceable member, said body being movable on said face, the movement of said body producing movement of said displaceable member,

2. A hole gauge having a displaceable forming an angle with the direction of movebody, a member displaceable in a direction ment of said body, the movement of said forming an angle With the direction of touch element producing movement of said movement of said body, an indicating debody.

5 vice, said displaceable member being c-on- The foregoing specification signed at Swe- 15 nected to said indicating device, a member den, this 6th day of October, 1920. provided with a face, inclined to the direc- MAX BARTHOLDY. tion of movement of said displaceable mem- In presence of her, said body being movable on said face, P. A. HERNELL,

10 a touch element displaceable in a direction G. SJKGNER. 

